A. Sino atrial node (SAN)
B. Atrio ventricular node (AVN)
C. Purkinje fibers
D. papillary muscles
# The dominant second tropical level in a lake ecosystem is:
A. Phytoplankton
B. Benthos
C. Plankton
D. Zooplankton
# Which gas contributes maximum to the green house effect on the earth?
A. CO2
B. CCl2F2
C. Freon
D. Methane
# Which of the following is the function of exterogastrone?
A. It inhibits the secretion of gastric juice
B. It stimulates the secretion of digestive juices in the stomach
C. It stimulates the pancreatic juice
D. It regulates the flow of the bile
# Coelom derived from blastocoel is known as a:
A. Pseudocoelom
B. Schizocoelom
C. Haemocoel
D. Enterocoel
# Which of the following does not have an open circulatory system?
A. Frog's tadpole
B. Prawn
C. Crab
D. Cockroach
# The immediate cause of induction of ovulation in human female is large plasma surge of:
A. LH
B. FSH
C. Progesteron
D. Estradiol
# The earliest fossil form in the phylogeny of horses is called:
A. Equus
B. Mesohippus
C. Eohippus
D. Merychippus
# Albinism is a congenital disorder resulting from the lack of the enzyme:
A. Tyrosinase
B. Xanthine oxidase
C. Catalase
D. Fructokinase
# A disease caused by eating fish contaminated by industrial waste, containing mercury compounds is called:
A. Osteosclerosis
B. Hashimoto's disease
C. Paget's disease
D. Minamata disease
# Tobacco mosaic virus (TMV) genes are:
A. Single stranded RNA
B. Double stranded DNA
C. Proteinaceous
D. Double stranded RNA
# 'Lac operon' in E. coli is induced by:
A. I genes
B. Promoter genes
C. B galactosidase
D. Lactose
# A child's blood group is 'O'. The parents' blood group cannot be:
A. A and B
B. A and A
C. AB and O
D. B and O
# The movement of auxin is largely:
A. Centripetal
B. Basipetal
C. Acropetal
D. Both A and B
# Procambium is situated just behind apical meristem. Procambium gives rise to:
A. Primary vascular cambium
B. Vascular cambium
C. Cork cambium
D. Both A and B
# When pollen of a flower is transferred to the stigma of another flower of the same plant, the pollination is referred to as:
A. Autogamy
B. Geitonogamy
C. Xenogamy
D. Allogamy
# In chlorophyceae, the mode of sexual reproduction is:
A. Isogamy
B. Anisogamy
C. Oogamy
D. All of the above
# The estrous cycle is a characteristics of:
A. Human females only
B. Mammalian female other than primates
C. Human males
D. Mammalian male other than primates
# The closure of lid of pitcher in a pitcher plant is due to:
A. Paratonic movement
B. Autonomic movement
C. Turgor movement
D. Tropic movement
# The CO2 fixation during C4 pathway occurs in the chloroplast of:
A. Guard cell
B. Bundle sheath cell
C. Mesophyll cell
D. Spongy parenchyma
# Linseed rust is caused by:
A. Albugo
B. Melampsora
C. Clariceps
D. All
# The prokaryotic flagella possess:
A. Helically arranged protein molecules
B. 1+2 membrane enclosed structure
C. Unit membrane enclosed structure
D. Protein membrane enclosed structure
# The primary acceptor during CO2 fixation in c3 plants is:
A. PEP (Phosphoenol pyruvate)
B. Phosphoglyceric acid (PGA)
C. Ribulose 1,5 diphosphate (RuDP)
D. Ribulose monophosphate
# The tailed bacteriophage are:
A. Motile on surface of bacteria
B. Non motile
C. Motile on surfaces of plant leaves
D. Actively motile in water
# The plant body of moss (Funaria) is:
A. Completely sporophyte
B. Predominantly gametophyte with sporophyte
C. Completely gametophyte
D. Predominantly sporophyte with gametophyte
# The closely related morphologically similar sympatric population but reproductively isolated are designated as:
A. Clones
B. Sibling species
C. Clines
D. Demes
# The form of canal system in sponges is due to:
A. Folding of inner wall
B. Gastrovascular system
C. Reproduction
D. Porous walls
# The animals of cold countries have relatively shorter and poorly developed ears, eyes, hairs and other phenotypic characters. This is known as which law?
A. Cope's law
B. Dollo's law
C. Allen's law
D. Bergaman's law
# A person whose father is color blind marries a lady whose mother is a daughter of a color blind man. Their children will be:
A. All son color blind
B. Some son normal and some color blind
C. All color blind
D. All daughter normal
# What are the mostly diversed molecules in the cell?
A. Lipids
B. Mineral salts
C. Protein
D. Carbohydrate
# Which of the following is direct ancestor of Homo sapiens?
A. Australopithecus
B. Cro-Magnon
C. Neanderthal
D. Ramapithecus
# Which of the following is non essential for plants?
A. Zn
B. Na
C. Ca
D. Mo
# Lampbrush chromosomes are seen in which typical stage?
A. Mitotic metaphase
B. Meiotic prophase
C. Mitotic anaphase
D. Mitotic prophase
# Which of the following is the typical example of feedback inhibition?
A. Cyanide and cytochrome reaction
B. Sulpha drugs and folic acid synthesizer bacteria
C. Allosteric inhibition of hexokinase by glucose -6- phosphate
D. Reaction between succinic dehydrogenase and succinic acid
# Improvement of human race by controlled selective breeding between individuals with desired characteristics is called:
A. Inbreeding
B. Exthensis
C. Eugenics
D. None of these
# Gibberellic acid induces flower:
A. In short day plants under long day conditions
B. In day neutral plants wider dark conditions
C. In some gymnospermic plants only
D. In long day plants under short day condition
# When a cell is fully turgid, which of the following will be zero?
A. Turgor pressure
B. Water potential
C. Wall pressure
D. Osmotic pressure
# Which of the following is free living aerobic non photosynthetic nitrogen fixing bacterium?
A. Nostoc
B. Azospirilium
C. Rhizobium
D. Azotobacter
# Which of the following is used to defoliate the forest?
A. Malic hydrazide
B. 2,4 D
C. Amo 168
D. Phosphon D
# The age of the fossils of Dryopithecus on the geological time scale is:
A. 2.5 *10^6 years back
B. 50 *10^6 years back
C. 75 *10^6 years back
D. 25 *10^6 years back
# Solenocytes are main excretory structure in:
A. Echinodermata
B. Platyhelminthes
C. Annelids
D. Mollusca
# Which of the following is filter feeder?
A. Sponge
B. Sepia
C. Whale
D. All
# Number of spinal nerves in rabbit:
A. 31 pairs
B. 32 pairs
C. 38 pairs
D. 37 pairs
# Cnidoblast cells are found in:
A. Epidermis
B. Endodermis
C. Both
D. Mesogloea
# Hensen's cell is found in:
A. Eye
B. Ear
C. Both
D. Spleen
# Meristem responsible for extrastellar secondary growth in dicotyledonous stem:
A. Interfascicular cambium
B. Intercalary meristem
C. Phellogen
D. Intrafascicular cambium
# The phenomenon of 'industrial melanism' demonstrate:
A. geographical isolation
B. reproductive isolation
C. natural isolation
D. Induced mutation
# Which of the following is a pollution related disorder?
A. Silicosis
B. Pneumoconiosis
C. Fluorosis
D. Leprosis
# Land mass occupied by forest is about:
A. 30%
B. 60%
C. 11%
D. 22%
# Energy transfer from one trophic level to other in a food chain is:
A. 10%
B. 20%
C. 1%
D. 2%
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